Xiaoyue Wang, Haotian Shi, Zijian Wang, Bo Peng, Ming Yan, Weiwei Liu. Research on Detection Technology of Fluorescence Enhanced Spectroscopy Based on Counter-Propagating Filaments[J]. Chinese Journal of Lasers, 2023, 50(7): 0708005
- Chinese Journal of Lasers
- Vol. 50, Issue 7, 0708005 (2023)
Fig. 1. Experimental setup for two collinear laser beams propagating in opposite directions
Fig. 2. Comparison of fluorescence signals induced by collinear counter-propagating filaments and single laser filament. (a) Fluorescence spectra in which triangle represents peak value of fluorescence line; (b) intensity of filament induced fluorescence signal versus laser energy
Fig. 3. Attenuation time of filament induced fluorescence signals with different wavelengths. (a) 337 nm; (b) 427 nm; (c) 481 nm
Fig. 4. Fluorescence signal intensity excited by CPF versus delay time. (a) Intensity of fluorescence signal versus delay time at 350-900 nm; (b) R at characteristic peaks of N III 400.85 nm (rectangle) and N II 500.19 nm (dot) versus delay time
Fig. 5. Fluorescence spectra when solution mass fraction is 2000×10-6. (a) KCl solution; (b) Na2SO4 solution; (c) MgSO4 solution
Fig. 6. Relationship between solution mass fraction and fluorescence intensity. (a) KCl solution; (b) Na2SO4 solution; (c) MgSO4 solution
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